This report details the latest findings from the biennial Maryland Adolescent Survey of the extent and trends in alcohol, tobacco, and drug use among students. To permit comparisons with national findings and trends, the form and content of survey items parallel those of the annual national study "Monitoring the Future," conducted by the University of Michigan Survey Research Center for the National Institute of Drug Abuse. Participants were 18,205 students drawn from grades 6, 8, 10, and 12 in public middle and high schools according to a multistage stratified cluster sampling procedure that allows the generalization of results for each grade. The 1994 survey reveals that alcohol use continues to be common among tenth and twelfth graders and has increased since 1992. Cigarette smoking has declined slightly among twelfth graders, but is up among the other grades since 1992. Other substances that show an increase in use are marijuana, LSD, and inhalants, with inhalants use increasing significantly among eighth graders. Findings also reveal substantial differences among racial and ethnic groups in use patterns. It is also of interest that more users than nonusers of alcohol and tobacco believe that their behavior is acceptable to friends and parents. Users of alcohol, tobacco, and drugs receive less parental supervision than nonusers. The survey further reveals that Maryland use rates are higher than national rates for all substances and ages except cigarette use by twelfth graders, a fact that may be due to the urban nature of Maryland's population. Four appendixes present schools not included in the sampling frame, the survey itself, teacher instructions, and local education agency tables. (Contains 39 tables and 23 figures.) (SLD)